高能超声对Al-20Si合金组织和力学性能的影响  

Effects of High-intensity Ultrasonic Treatment on Microstructure and Mechanical Properties of Hypereutectic Al-20Si Alloy

作　　者：杨俊[1] 程和法[1] 黄笑梅[1] 肖志玲[1] 刘铭[1] 

机构地区：[1]合肥工业大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2010年第8期769-771,共3页Special Casting & Nonferrous Alloys

基　　金：安徽省自然科学基金资助项目(090414197)

摘　　要：采用高能超声波对Al-20Si合金进行熔体处理,研究超声波处理对Al-20Si合金微观组织形貌及其力学性能的影响。结果表明,在660℃温度下,对Al-20Si合金熔体进行高能超声波处理,可以使Al-20Si合金的初晶硅形貌由粗大的板片状逐渐变成细小的球状颗粒,圆整度高,分布均匀,并且使其抗拉强度和伸长率提高。通过对合金拉伸断口形貌的观察,发现在经过超声处理的Al-20Si合金断口上有较多的撕裂带和韧窝,表现为脆性断裂和韧性断裂的混合型断口。Effects of high-intensity ultrasonic treatment on microstructure and mechanical properties of hypereutectic Al-20Si alloy were investigated. The results reveal that primary Si phase in the Al-20Si alloy can be converted from coarse plate gradually into fine spherical particle with uniform distribution after high intensity ultrasonic treatment,which is responsible for the improvement of tensile strength and elongation of the alloy. Observation of tensile fracture morphology shows that tearing strips and dimples much occurs in the fracture of Al-20Si alloy treated by high intensity ultrasonic treatment,characterized by mixed fracture of brittle and toughness crack.

关 键 词：超声波处理 AL-20SI合金 微观组织 力学性能 断裂机制 

分 类 号：TG146.21[一般工业技术—材料科学与工程]